[jira] [Comment Edited] (CALCITE-4514) [CALCITE-4514] Fine tune the merge order of two RelSets

["Botong Huang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17293313#comment-17293313 ] 

Botong Huang edited comment on CALCITE-4514 at 3/2/21, 3:12 AM:
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Hi [~danny0405], openning a new Jira for it might be an overkill. Can you fix the typo for us and push? Thx! 


was (Author: botong):
Hi [~danny0405], openning a new Jira for it might be an overkill. Can you fix the typo for us and push? 

> [CALCITE-4514] Fine tune the merge order of two RelSets
> -------------------------------------------------------
>
>                 Key: CALCITE-4514
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4514
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Botong Huang
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.27.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> When merging two relsets, we have two preferences: 
> 1. Merge parent relset into child relset
> 2. Merge newer relset into older relset
> Currently, when the two relsets are parent set of each other, we randomly pick a merge order without checking the second condition above. For performance reasons, we should, to avoid unnecessary churn. 



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